CN218016027U - Indexable disc-shaped milling cutter for machining twisted blade rotor of Roots blower - Google Patents

Abstract

The utility model provides a processing roots blower turns round but transposition disk milling cutter of leaf rotor, including the benchmark pipe and a plurality of blade framves that set up in the benchmark pipe outside along its circumference, be provided with the fixed block between the adjacent blade frame, every blade frame outside is equipped with the circular blade constant head tank that is used for removable installation circular blade, circular blade constant head tank both sides are provided with the square constant head tank that is used for removable installation square blade. The utility model relates to a rationally, simple structure, convenient to use can improve machining efficiency by a wide margin, reduces manufacturing cost, can change wearing and tearing blade moreover alone, extension cutter life.

Description

An Indexable Disc Milling Cutter for Machining Rotary Blade Rotor of Roots Blower

technical field

The utility model relates to an indexable disc-shaped milling cutter for processing twisted-blade rotors of Roots blowers.

Background technique

Roots blower is a common rotary fluid compression machine. As one of the important equipment in domestic modern industry, it has various installation methods, simple internal structure, no need for lubrication in the inner cavity during operation, stable exhaust volume, smooth operation, and volumetric efficiency. It is high and has the advantages of no oil in the transmission fluid, so it is widely used in industries such as building materials, grain, aquatic product farming, and sewage and wastewater treatment.

The processing method of the twisted blade rotor of the existing Roots blower has low efficiency and high cost, which has always limited the popularization and application of the twisted blade rotor. Moreover, the traditional twisted blade rotor milling cutter adopts a solid carbide integral structure, and the blade is integrally formed on the tool holder. After a long period of processing, the blade wears seriously. The entire milling cutter can be replaced, and the tool replacement cost is high and the efficiency is low.

Utility model content

The utility model improves the above problems, that is, the technical problem to be solved by the utility model is to provide an indexable disc milling cutter for processing the twisted blade rotor of Roots blower, which is convenient and efficient to use.

The utility model is constituted in such a way that it includes a reference circular tube and a plurality of blade holders arranged outside the reference circular pipe along its circumference, fixed blocks are arranged between adjacent blade holders, and each blade holder is provided with a A circular blade positioning groove for detachably installing a circular blade, and square positioning grooves for detachably installing a square blade are arranged on both sides of the circular blade positioning groove.

Further, fastening nuts are provided at both ends of the reference circular pipe, and a bevel fixing ring is provided between the fastening nuts and the blade holder.

Further, the contact surface between the inner surface of the inclined fixing ring and the blade holder is an inclined surface that cooperates with each other.

Further, the circular blade and the square blade are mounted on the blade frame by hexagon socket head bolts.

Further, the fixed block is fixed on the reference circular pipe with hexagon socket head cap screws.

Compared with the prior art, the utility model has the following beneficial effects:

1. The blade and the tool holder with the blade positioning groove adopt a split structure. After the blade wears out, there is no need to replace the whole milling cutter, which has the advantages of easy installation and quick disassembly;

2. The installed blade has high stability, which improves the machining accuracy of the twisted blade rotor;

3. The blade is indexable. When the blade at one end is damaged, it can be replaced by indexing to another blade for cutting, which prolongs the service life of the blade, improves the service life of the blade and reduces the processing cost;

4. The whole milling cutter adopts the combination of cemented carbide material and steel material to reduce the production cost.

Description of drawings

Fig. 1 is the perspective view of the utility model embodiment;

Fig. 2 is the front view of the utility model embodiment;

Fig. 3 is a partial cross-sectional view of the position of the blade of the embodiment of the utility model;

Fig. 4 is a schematic diagram of contour fitting of a disc milling cutter according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of the arrangement of the blades in the embodiment of the utility model;

Fig. 6 is a partial front view of the reference circular pipe of the embodiment of the utility model;

Fig. 7 is a sectional view of the reference circular pipe of the embodiment of the utility model;

Fig. 8 is a structural schematic diagram of a blade holder, a circular blade and a square blade according to an embodiment of the present invention;

Fig. 9 is a sectional view of the utility model embodiment;

Fig. 10 is a schematic diagram of the circumferential fixation of the blade holder according to the embodiment of the present invention;

Fig. 11 is the front view of the fixed block of the embodiment of the utility model;

Fig. 12 is a side view of the fixing block of the embodiment of the present invention.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Embodiment: Referring to the accompanying drawings 1-12, an indexable disc milling cutter for processing Roots blower twisted blade rotors is provided, including a reference circular tube 9 and a plurality of blades arranged outside the reference circular tube along its circumferential direction Frame 3, fixed block 6 is arranged between adjacent blade holders, each blade holder outside is provided with circular blade positioning groove 4 for detachable installation of circular blade 1, described circular blade positioning groove both sides are provided with useful With the square positioning groove 5 of detachable installation square blade.

In this embodiment, fastening nuts 8 are provided at both ends of the reference circular tube, and a bevel fixing ring 7 is provided between the fastening nuts and the blade holder.

The two ends of the above-mentioned reference circular pipe are provided with external threads to match the internal threads of the fastening nut; through the cooperation of the fastening nut and the external thread of the reference circular pipe, the axial inward thrust of the inclined plane fixing ring is ensured, thereby Ensure the axial positioning of the blade holder at the left and right ends.

A threaded hole is opened on the above-mentioned reference circular pipe, and the hexagon socket cap screw 10 penetrates the fixing block and the threaded hole to position and fix the fixing block.

A central hole is provided in the middle of the above-mentioned reference circular tube for cooperating with the main shaft of the machine tool.

In this embodiment, the contact surface between the inner surface of the inclined fixing ring and the blade holder is an inclined surface that cooperates with each other.

The bevel fixing ring realizes the axial fixing of the blade holder, and there is a gap between the left and right ends of the bevel fixing ring and the blade holder, which is convenient for adjustment of errors in actual processing. The inclination angles of the two slopes are the same, and this angle can realize self-locking between the slopes, increasing the reliability of fixing.

In this embodiment, the circular blade and the square blade are installed on the blade frame by hexagon socket head bolts 2 .

The blade holder can be designed as twelve detachable blade holders. According to the shape and position of the blade, the corresponding circular blade positioning groove and square blade positioning groove are processed on the blade holder. There are mounting holes on the blade holder. The square blade positioning groove is provided with a connection hole communicating with the installation hole, and the connection hole penetrates to the wall of the blade holder, and the indexable blade can be disassembled and installed in the blade positioning groove through the hexagon socket countersunk head bolt.

In this embodiment, the fixing block is fixed on the reference circular pipe by hexagon socket head cap screws 10, and its function is to realize the circumferential fixing of the blade holder.

In this embodiment, the circular blades and square blades are arranged in a spiral.

The spiral arrangement is to arrange the adjacent blades on the tool holder in sequence. As the tool rotates, the adjacent blades cut the workpiece in turn, which avoids the uneven change of the cutting force and can also ensure the same The distance between the blades arranged on the blade holder is maximized, there is no interference between the blade grooves, and the cutting impact is more dispersed.

In this embodiment, during installation: the fixed block is installed on the reference circular pipe through the hexagon socket head cap screw; the blade holder piece is clamped by the angle of two adjacent fixed blocks, thereby realizing Position limit; provide axial inward thrust by tightening the fastening nuts at both ends of the reference circular tube to ensure the axial positioning of the blade holder; according to the shape of the blade, the circular blade and square blade are installed on the blade with hexagon socket head bolts The circular blade positioning groove and the square positioning groove of the frame; when the circular blade or the square blade is worn out, the blade at one end can be replaced by indexing to the other blade after being damaged, and then cut after being fixed.

Embodiment 2: In this embodiment, the design of the indexable disc milling cutter is as follows:

1. Blade positioning and clamping method:

The indexable disc milling cutter is mainly used for the rough machining of the twisted blade rotor of the Roots blower. The accuracy of the blade fitting profile curve is high, and there is no high demand for the positioning accuracy of the blade. The blade positioning selects the surface positioning method, such as As shown in Figure 3, its positioning contact area is large, the load is dispersed, the support is stable, and the positioning accuracy is maintained for a long time. Considering the overall structure of the blade holder and the distribution of the blades, the blade clamping method uses hexagon socket head bolts for positioning. This positioning method can not only meet the requirements for the blade positioning method, but also effectively reduce the space occupied by positioning. Suitable for the positioning of this tool.

2. Knife body design:

As shown in Figure 4, the contour curve of the milling cutter has both convex and concave parts on the whole. If only square inserts are used for fitting, the convex part of the curve will be particularly densely arranged. It is impossible to install without interference on the entire disc cutter, so two kinds of blades are used for fitting when selecting the blade, one is to use a circular blade to fit the convex arc, and the other is to use a square blade to fit In this way, the overall number of blades used for fitting is relatively small, and when positioning on the entire disc cutter, it can be arranged without interference.

The top profile curve of the cutter body can be obtained by indenting the theoretical profile curve of the milling cutter to a certain degree, and the indentation amount depends on the feed rate when the tool is working. The reference round tube, fixed block and blade frame are all made of steel, the blade material is cemented carbide, and the processing material is ductile iron. When cutting, the temperature at the cutting edge of the tool is higher and the compressive stress will be greater. Referring to the relevant information on machining ductile cast iron with cemented carbide tools, if the feed rate is determined to be 0.2 mm, the indentation amount can be set to 1 mm.

During the working process of the indexable disc milling cutter, the cutting impact is mainly borne by the blade. In order to avoid the cutting impact from being too concentrated on some blades, it is necessary to optimize the arrangement of the blades reasonably to prolong the service life of the blades. When the cutter body has a symmetrical structure, the symmetrical arrangement of the blades is usually adopted, which can effectively reduce the cutting impact strength on the cutter during the working process. The arrangement method will cause the blades to interfere with each other. Therefore, it is decided to adopt the spiral arrangement of the blades. The arrangement method is shown in Figure 5. The spiral arrangement is to arrange the adjacent blades on the tool holder in sequence. As the tool rotates, the adjacent blades cut the workpiece in turn, which avoids the uneven change of the cutting force and can also ensure the same The distance between the blades arranged on the blade holder is maximized, there is no interference between the blade grooves, and the cutting impact is more dispersed.

3. Tool holder structure design:

The first is the design of the reference circular tube, as shown in Figure 6 and 7, the reference circular tube is used to fix other components, and its center hole is used to cooperate with the spindle of the machine tool, and there are threads on both ends for The subsequent fastening nut fixes the end face, and there are 24 threaded holes in the middle, which are used to realize the positioning of the fixing block, and the post-adjustment is to ensure the position of the blade holder.

Then design the blade holder for blade positioning. In order to reduce the problem of large cutting impact of the disc milling cutter, the disc milling cutter is designed as an insert type, and a complete curved arc (contact line) is simulated by multiple blades. Co-processing. In the actual design process, due to the large number of indexable inserts, the tool holder has a large number of teeth and a small pitch. Therefore, interference is prone to occur when machining the positioning groove of the topmost insert, and the processing is difficult. In order to solve the above problems, the tool holder is designed as a split type, that is, the tool holder is designed as twelve detachable blade holders. The structure of a single blade holder is shown in Figure 8. According to the shape and position of the blade, the corresponding The blade positioning groove is provided with a connection hole communicating with the mounting hole on the blade positioning groove, and the connection hole runs through to the wall of the blade holder, and the indexable blade can be disassembled and installed in the blade positioning groove by connecting piece bolts.

4. Fixing method of blade holder:

The axial fixing method of the turret piece is shown in Figure 9. It can be seen from the figure that the turret piece is fixed by contacting the inclined surface of the beveled fixing ring to generate an axial force to fix it, and the front and rear ends of the contact are left The gap is convenient for adjustment in actual processing. The inclination angles of the two slopes are the same, and this angle can realize self-locking between the slopes, increasing the reliability of fixing. The inclined-plane fixing ring is pushed by a push plate to ensure that the inclined-plane fixing ring and the tool holder are closely fixed, and the push plate is tightened and matched with the fastening nut and the external thread of the reference circular pipe to ensure the inward thrust of the push plate; Ensure the positioning of the blade holder at the left and right ends, and realize the axial positioning of the blade holder.

The circumferential fixation of the tool holder is realized by the fixing blocks on both sides. As shown in Figure 10, first fix the fixing block and the reference round pipe with hex socket head cap screws, but leave a gap of 2 mm between them for subsequent The adjustment provides space, and the clamping of the knife holder is realized by adjusting the two fixed blocks with each other, and the left and right angles can be adjusted by adjusting the size of the gap to ensure the circumferential position of the knife holder.

Common indexable tools are mainly composed of several parts such as cutter body, blade, positioning element and clamping element. Each part corresponds to its own function and is indispensable. The function of the cutter body is to carry all the parts, and each part is assembled on the cutter body to form a complete tool, and the connection between the tool and the processing machine tool also needs to be completed through the cutter body; the indexable insert is the main working element in the tool, The cutting edge is in direct contact with the processing material; the positioning element is to determine the position of the cutting edge to ensure the machining accuracy of the tool; the function of the clamping element is to firmly clamp the blade on the tool body to prevent the blade from loosening during tool processing Even the case of separation from the knife. In the structural design of the indexable disc milling cutter, in order to simplify the structure of the cutter, it was decided to omit the shim part, and its function was replaced by the positioning groove of the blade.

In order to reduce the cost of the tool, the insert type blade and the combined tool holder are used. The indexable disc milling cutter body of this design has a complex design, so the use of mechanical clamping can greatly save costs for subsequent production; and because the disc milling cutter wears a lot on the blade, and it is more difficult to set the tool each time The blade is large, so the insert uses an indexable insert. When the cutting edge in use is worn out, the blade can be unfixed because it is mechanically clamped, and then the cutting edge in use is adjusted in and clamped again. The tool can continue to be used, which can ensure that the replaced tool does not need to be repositioned, and the tool body does not need to be replaced, which can greatly improve work efficiency, save time and cost, and improve the utilization rate of the machine tool. Moreover, the indexable blade is adopted, which has reasonable geometrical parameters and is a standard part, without the disadvantage of manual sharpening. The device mills the twisted vane rotor through an indexable disc milling cutter. The use of indexable inserts can improve the tool life, reduce the number of tool adjustments and changes, and shorten the auxiliary time to the greatest extent. The use of disc cutters for processing can greatly increase the cutting speed and increase the metal removal rate per unit time. The design can ensure high precision machining, and the versatility of the blade provides great convenience for subsequent replacement of blade wear, which can greatly reduce the additional cost of subsequent tool replacement.

Any technical solution disclosed in the above-mentioned utility model, unless otherwise stated, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred numerical range is only It is the value with obvious or representative technical effects among many implementable values. Since there are too many numerical values to list exhaustively, the utility model only discloses some numerical values to illustrate the technical solution of the utility model, and the numerical values listed above should not constitute limitations to the protection scope of the utility model.

If words such as "first" and "second" are used herein to define components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the components. Unless otherwise stated, the above words have no special meanings.

At the same time, if the above-mentioned utility model discloses or relates to parts or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as using a bolt or screw connection), or It can be understood as: non-detachable fixed connection (such as riveting, welding), of course, the mutual fixed connection can also be replaced by an integrated structure (such as one-piece manufacturing by casting process) (except that the integral forming process cannot be used obviously).

In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in the present utility model to indicate positional relationships or shapes include states or shapes that are similar, similar or close to them.

Any component provided by the utility model can be assembled from a plurality of individual components, and can also be a single component manufactured by an integral forming process.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model and not limit it; although the utility model has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should understand that: still The specific implementation of the utility model can be modified or some technical features can be equivalently replaced; without departing from the spirit of the technical solution of the utility model, all of them should be included in the scope of the technical solution claimed by the utility model.

Claims (5)

1. The indexable disc-shaped milling cutter for machining twisted blade rotors of Roots blowers is characterized by comprising a reference circular tube and a plurality of blade holders arranged outside the reference circular tube along the circumferential direction of the reference circular tube, wherein a fixed block is arranged between every two adjacent blade holders, a circular blade positioning groove for detachably mounting a circular blade is arranged outside each blade holder, and square positioning grooves for detachably mounting square blades are arranged on two sides of each circular blade positioning groove.

2. The indexable disc milling cutter for machining twisted blade rotors of roots blowers according to claim 1, wherein the reference circular tube is provided with fastening nuts at both ends thereof, and a bevel fixing ring is arranged between the fastening nuts and the blade holder.

3. The indexable disc milling cutter for machining twisted blade rotors of roots blowers according to claim 2, wherein the contact surfaces of the inner side of the bevel retainer ring and the blade holder are mutually matched bevels.

4. The indexable disc milling cutter for machining twisted blade rotors of roots blowers according to claim 1, wherein the circular and square blades are mounted on the blade holder by means of hexagon socket countersunk head bolts.

5. The indexable disc milling cutter for machining twisted blade rotors of roots blowers according to claim 1, wherein the fixed block is fixed to the reference circular tube by means of hexagon socket head cap screws.

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